I'm battling dino in my tank as well... going on 6 months now. At first I tried treating it as cyano with chemiclean.. when that did nothing I was left with two possibilities, either dino or diatoms. I ruled out diatoms because the stuff in my sandbed would sometimes get really thick during the day and recede to almost nothing when the lights go out. I also can't seem to keep snails alive in my tank which is a good indicator since some strains of dino are known to be toxic. I tried lights out for 4 days, syphoning the sand daily, but nothing seemed to work. About a month ago i stumbled upon Reefdudes video on dino eradication (
). It's a looong video but well worth the listen if you're desperate like me. He shares a one week treatment that supposedly works quite well. The system basically encourages you to create a mini bacteria bloom in your tank to outcompete with the dino strain. You dose your tank with ATM colony and Waste Away bacteria for a week (watch video for full instruction). The first round that i tried of this treatment i kinda half-assed. Did not follow the instruction to the tee.. would miss dosing some days but despite my laziness after a week I noticed a significant regression of the dino on my sand. So i gave my tank a week to rest then tried the treatment again. Unfortunately, a family thing came up and again i wasn't able to follow thru with the one week treatment. Last friday I started the treatment again and yesterday when i got home from work, with the tank lights still at full blast, my sand was white as snow! I'm trying not to get excited just yet. I will finish this treatment without skipping a beat and we'll see if my sand stays clean after a week of so. If it does, I will make sure to post step by step what I did to win this battle *cross fingers*